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Re: [Qemu-devel] SIGSEGV on Windows with KQEMU enabled


From: Anthony Liguori
Subject: Re: [Qemu-devel] SIGSEGV on Windows with KQEMU enabled
Date: Fri, 06 Mar 2009 20:51:40 -0600
User-agent: Thunderbird 2.0.0.19 (X11/20090105)

Consul wrote:
First, the current SVN (6731) does not compile on Windows due to missing asprintf.

With what toolkit?  It builds for me.

Regards,

Anthony Liguori

This hack lets me compile the app, but running a Windows XP image gives SIGSEGV during the boot. As Robert mentioned in another thread it might be a binutils bug after all - I'm using 2.19 - but it might be as well a kqemu bug. The crash happens in kqemu.c. See the trace below.

Note: SIGSEGV does not happens with -no-kqemu

===================================================================
--- vnc.c       (revision 6731)
+++ vnc.c       (working copy)
@@ -62,10 +62,14 @@
                   err, gai_strerror(err));
         return NULL;
     }
-
+#ifndef _WIN32
     if (asprintf(&addr, format, host, serv) < 0)
         return NULL;
-
+#else
+    if (!(addr = malloc(512)))
+        return NULL;
+    sprintf(addr, format, host, serv);
+#endif
     return addr;
 }

===================================================================

Starting program: c:\test\qemu/i386-softmmu/qemu.exe -L c:\qemu-dist -hda c:\qemu-img\wxp.q2 -fda c:\qemu-img\boot.bin -boot c -localtime -m 512 -soundhw es1370 -net nic,model=rtl8139 -net tap,ifname=TAP0 -kernel-kqemu
[New thread 3488.0xd48]
[New thread 3488.0xde0]
[New thread 3488.0xcb0]
[New thread 3488.0xfb0]
[New thread 3488.0xba8]
[New thread 3488.0x3bc]
[New thread 3488.0x484]

Program received signal SIGSEGV, Segmentation fault.
kqemu_cpu_exec (env=0x2ef9eff8) at c:/test/qemu/kqemu.c:475
475         asm volatile ("fxrstor %0" : "=m" (*fp));
(gdb) bt
#0  kqemu_cpu_exec (env=0x2ef9eff8) at c:/test/qemu/kqemu.c:475
#1  0x004ac1e6 in cpu_x86_exec (env1=0x806ef000)
    at c:/test/qemu/cpu-exec.c:317
#2  0x00407f38 in qemu_get_timedate (tm=<value optimized out>, offset=1)
    at c:/test/qemu/vl.c:1816
#3  0x00000000 in ?? ()
(gdb)









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